Chihuahuas are known for their excessive licking, and there are several reasons why they do it. It could be a sign of affection, hunger, submission, or boredom/stress. They may also enjoy the taste of your skin. However, it is important to note that allowing your Chihuahua to lick your face can be unhygienic and may lead to health issues. When it comes to babies, Chihuahuas should be kept at a safe distance due to potential health risks.